Straw cutting mechanism for straw manufacturing machines



Nov. 20, 1951 A. A. HEYMAN 2,575,417

STRAW CUTTING MECHANISM FOR STRAW MANUFACTURING MACHINES Originai Filed Jan. 24', 1947 Albert Abci Hayman,

Patented Nov. 20,1 951 STRAW CUTTING MECHANISM FOR- STRAW MANUFACTURING MACHINES I Albert Aba Heyman,Baltimore,'Md.,assignor to". v I

' Joseph Shapiro, Baltimore, Md. V g

Original application January 24, 1947, Serial No.14 Q 723,985. Divided and this application Octohery 29, 1947, Serial No. 782,931. In Great Brltain April 14, 1947 2 Claims. (Cl. 164-42) My invention, which relates to machines for 'making spirally wound straws from paper strips, has for its objects:

1. To improve the machine 'disclosedin ll. S. Letters Patent No. 1,911,298 issued May 30, 1933 and No. 1,967,171 issued July 17, 1934 and,

2. To provide an improved straw-cutting mechanism.

Other objects will in part be obvious and in part be pointed out hereinafter.

To the attainment of the aforesaid objects and ends invention still further resides in the novel detail of construction, combination and arrangement of parts, all of which will be first fully described in the following detailed description, and then be particularly pointed out in the appended claims, reference being had to the accompanying drawing, in which:

Fig. 1 is a top plan view of a portion of a straw making machin with my invention applied.

Fig. 2 is a side elevation of the same, showing a slight modification of the drive between the motor and the gear box.

Fig. 3 is a detail end view looking from left to right in Figs. 1 and 2.

Fig. 4 is an enlarged detail-end view of the knife arm and blade and a portion of the final straw uide.

Fig. 5 is a detail elevation of one form of a two-part V-type pulley that may be used on the motor shaft.

Fig. 6 is a similar view of another form of twopart V-type pulley that may be used.

In the drawing in which like numerals of reference indicate like parts in all the figures, l represents the bed of the machine which is supported on a frame composed of upper and lower horizontal angles 4 and legs 2.

5 designates the usual intermediate straw guides which direct the straw from th forming mandrel of the machine to the cutting mechanism.

The cutting mechanism involves a fixed guide 6 which is provided with an elongated tubular shank 1 that is adjustably held by a set screw 40, in a support 4| and has its outer end tapered as at 8 and provided with a flat edge 9 (Figs. 1, 2 and 4) A hearing bracket I is secured to the base I and carries a crank shaft l I on which is a disc l2 having a wrist pin l3 to which one end of an arm I! is pivoted. The arm is slotted and a bolt l passes through a slide block l6, through the slot in the arm and into an extension I4 of the bracket Hi to constitute a shifting pivot for the j i 1;; arm ll. The arm llcarriesa knifeblade l3rmovably held in place'by'a' suitable clamp'l 8. The knife blade I9 is of generally triangular-cross section and is held withthe flat side of the blade canted at-anapproxiinatean'gle of 25 degrees to the outer vertical edge 9 of the guide I in order to permit the continuous straw to advance without interference by the knife blade l9.

The mechanism for driving the cutter includes a platform 3| which is adjustably suspended by slotted arms 28 secured by cap screws 30 to arms 29 depending from a plate 25 that is welded to the bed i; a suitable motor 22 is mounted on the platform. On the motor shaft is a two-part V- type pulley. This pulley may be constructed as shown either in Fig. 5 or in Figs. 2 and 6.

As shown in Figs. 2 and 6 one part 45 of the pulley is pinned to the shaft 32 while the other part 46 is slidable along the shaft toward the part 45 under the action of a spring 48 held in the cup 41 that is pinned to the end of the shaft. A belt 21 passes over the pulleys 26 and 45, 48. A belt tension adjuster or tightener comprising a pivoted arm 34 carrying a roller 35 that engages the belt is adjustable via a screw 31 swivelly connected to a lug 39 of the arm 34 and threaded through a bracket 36. When this form of pulle is used the screws 30 remain fixed and the platform 3| is not adjustable up and down.

The other form of two-part V-type pulley that may be used is shown in Fig. 5. In that form one pulley part 33 is fixed to the motor shaft which shaft is threaded as at 43. The other pulley part 42 is threaded on the motor shaft and is held in its adjusted positions by means of a set screw 49. When this form of pulley adjustment is employed the belt tension is maintained on the different adjustments by raising or lowering the platform as the case may be.

By reference to Fig. 3 it will be seen that due to the provision of the slotted arm, the fixed pivot l5 and the crank action the cutter 'as it ap-' proaches the straw to be cut moves with greatest speed and gives a combined chop and drawaction on engaging the straw.

, Because of the angle of the blade l9 to the face of the shank l, the forward movement of the continuous straw will not be arrested or interferred with and a clean cut will be made by the knife blade.

Further, since the end of the guide is tapered as at 8, should the knife be slightly out of alignment, and engage the tapered surface, it willbe deflected off and allowed to pass the end 9 without breaking.

This application is a division of my application -filed January 24, 1947, Serial No. 723,985, now

Patent No. 2,501,938 issued March 28, 1951.

From the foregoing description, taken in connectiomwiththe accompanying drawings, it is thoughtthat the construction, operation and advantages of the invention will readily appear to those skilled in the art.

What I claim is:

1. In a spirally-wound-tube-making machine wherein a continuous tube is formedand fed to a cutting mechanism, the improvement which includes a guide through which said continuoustuhe I is passed, and a cutting mechanism operatively associated with said guide, said cutting mecha nism including a rotatable crank? shaft having a crank, a pivotall and longitudinally slidable am having one extremity connected to said crank and having a knife blade at its other extremity; the pivot being located at a place between said guide .and :saictwcmnk shait whereby the, knife: blade moves past the outlet of said guide atits timeof greatestspeed,

- 2.53); a spirally-wound-tube-making machine 1 wherein means are provided, for feeding a continshaft',a support havin'gQ'a bearing; for said shaft,

a crank on said shaft, a'fixed pivot carried by said support, a slotted arm pivoted at one end to said crank, said fixed pivot passing through said slot,

- and: a knife blade carried by said arm adjacent its. free end and in position to pass said guide to sever a section of tube at intervals.

ALBERT ABA HEYMAN.

REFERENCES CITED The following references are of record in the file ofi'this. patent:

UNITED STATES PATENTS Number Name! Date 7 1,6.()3,8.39 Midgley, Qct.- 19 .1926 1,842,229. Achard Jan. 1-9;,1932 1,857,324 Okumura e. May 16',- 19.32 

